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  • Case ID: 292106
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Shift low power PWM phase 180 degrees

Sophisti

Similar to t_m's post here (only in a different SDK), I am trying to generate two PWM signals (motor1_fwd_pwm & motor2_fwd_pwm) in 180 degrees phase shift in respect to each other.
I'm using SDK 17.1.0 and an nRF52833 module; currently I am initializing my PWM signals like so:

uint32_t err_code;
    low_power_pwm_config_t low_power_pwm_config;
    
    APP_TIMER_DEF(lpp_timer_0);
    low_power_pwm_config.active_high    = true;
    low_power_pwm_config.period         = STD_PERIOD;
    low_power_pwm_config.bit_mask       = BSP_M1_IN1_MASK;
    low_power_pwm_config.p_timer_id     = &lpp_timer_0;
    low_power_pwm_config.p_port         = NRF_GPIO;

    err_code = low_power_pwm_init((&motor1_fwd_pwm), &low_power_pwm_config, pwm_handler);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_duty_set(&motor1_fwd_pwm, 0);
    APP_ERROR_CHECK(err_code);

    APP_TIMER_DEF(lpp_timer_1);
    low_power_pwm_config.active_high    = true;
    low_power_pwm_config.period         = STD_PERIOD;
    low_power_pwm_config.bit_mask       = BSP_M1_IN2_MASK;
    low_power_pwm_config.p_timer_id     = &lpp_timer_1;
    low_power_pwm_config.p_port         = NRF_GPIO;

    err_code = low_power_pwm_init((&motor1_rvs_pwm), &low_power_pwm_config, pwm_handler);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_duty_set(&motor1_rvs_pwm, 0);
    APP_ERROR_CHECK(err_code);

    APP_TIMER_DEF(lpp_timer_2);
    low_power_pwm_config.active_high    = true;
    low_power_pwm_config.period         = STD_PERIOD;
    low_power_pwm_config.bit_mask       = BSP_M2_IN1_MASK;
    low_power_pwm_config.p_timer_id     = &lpp_timer_2;
    low_power_pwm_config.p_port         = NRF_GPIO;

    err_code = low_power_pwm_init((&motor2_fwd_pwm), &low_power_pwm_config, pwm_handler);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_duty_set(&motor2_fwd_pwm, 0);
    APP_ERROR_CHECK(err_code);

    APP_TIMER_DEF(lpp_timer_3);
    low_power_pwm_config.active_high    = true;
    low_power_pwm_config.period         = STD_PERIOD;
    low_power_pwm_config.bit_mask       = BSP_M2_IN2_MASK;
    low_power_pwm_config.p_timer_id     = &lpp_timer_3;
    low_power_pwm_config.p_port         = NRF_GPIO;

    err_code = low_power_pwm_init((&motor2_rvs_pwm), &low_power_pwm_config, pwm_handler);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_duty_set(&motor2_rvs_pwm, 0);
    APP_ERROR_CHECK(err_code);


    err_code = low_power_pwm_start((&motor1_fwd_pwm), motor1_fwd_pwm.bit_mask);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_start((&motor1_rvs_pwm), motor1_rvs_pwm.bit_mask);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_start((&motor2_fwd_pwm), motor2_fwd_pwm.bit_mask);
    APP_ERROR_CHECK(err_code);
    err_code = low_power_pwm_start((&motor2_rvs_pwm), motor2_rvs_pwm.bit_mask);
    APP_ERROR_CHECK(err_code);

I tried setting the active_high property to false for one and true for the other, but this led to other undesired effects. Is there a way to simply delay one of the timers by 1/2 period?

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